Taking a cue from some of the old salts I have talked to and articles I have read, you want to do everything you can to NOT look like something to eat.

While fishing or swimming in the surf do not wear white or light colored shoes. These can look like the belly of a fish, something to eat. Do not wade in shorts, wear pants netural in color, kahki in tone. The calves of your legs can again look like something to eat. Also do not wear anything that will 'flash' underwater.

If you have blood coming from any part of your body, DO NOT go into the water.